Integrate gitlab-ci/lpag/custom_conf and 7 more

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/400ff327edd87681f2f63133957e9816b792cf85

[NOTIFY] Increase timeout for notify job

* The notify job needs to pull the artifacts from all previous jobs and
as the number of boards increase the timeout needs to increase
accordingly.

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/34e9c6ddab72ac9198b54ad05a6edf9f8dcf0431

[SHA] Insert SHA of the manifest in artifacts name

* Instead of inserting the "weekly" string in the artifacts name, which is
  already defined in the Azure path, we insert the short SHA for not
tagged version of Edgehog.
* Remove TAG_NAME variable from "latest" tagged artifacts

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/b8dd7a1db61b9134ef96cab1689beceb422f68da

[KERNEL] Get main kernel version from bitbake

* Instead of setting the kernel version by variable, the kernel main
version is derived from the PREFERRED_VERSION of virtual/kernel used
by Yocto using bitbake commands.
* The following algorithm does not actually apply on the 'c31' and
'tanaro' boards, for which a different handling is applied.

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/9314c567b1ea364b91d38ccda3d494257fed5bb8

[ARTIFACTS][NAME] Handle equal variables

* Since for Intel boards the PROCESSOR and BOARD variable values
  coincides, it is necessary to handle this case and remove one of the
two variables from the artifact name.

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/74498c1ca35dcb66fd51fe02dac0a6db9959fc5c

[INTEL] Add "intel" generic machine handling

* From now on, the compiled image for all Intel CPU-based SECO boards
will be unique and not separate for different processor generations/flavours.
* Bump of the kernel version for all Intel architectures to rel. 6.1.
* Set KERNEL variable separately for each board and avoid the
  override of the value set in the generic yocto variables.

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/88420cc892a4a7568dc0b724dee9e0f9453e6d65

[C72NL] Insert c72 Nano Lite configuration

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/21286ffcc417228a7335b2fda1f9a6413b9df77a

[ARTIFACTS PATH] Fix on Azure path for imx8 boards

* Insert 'imx8' string in the path instead of the specific processor
  type.

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/b6968f7866814703fcfd59b38fc0f334f1840cc8

[CONF] Add handling of custom lines in local.conf

* Since custom projects may require to insert some flags in the
  'conf/local.conf' file (e.g. software products commercial licences)
we define the handling of the CUSTOM_CONF variable to contain the lines
that need to be inserted in the file.
* Update documentation accordingly.